Guidelines for Handling Electrostatic Sensitive Devices (ESD)

D-3

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
D.2 Electrostatic Charging of Persons

Charging

Every person with a non-conductive connection to the electrical potential of its

surroundings can be charged electrostatically.

Figure D-1 shows you the maximum values for electrostatic voltages which can

build up on a person coming into contact with the materials indicated in the figure.

These values are in conformity with the specifications of IEC 61000-4-2.

Voltage in kV
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
(kV
)
51020 30 40 5060 70 80 90100 Relative air
humidity in %
1
3
1Synthetic material
2Wool
3Antistatic material,
for example, wood
or concrete
2
Figure D-1 Electrostatic Voltages which Can Build up on a Person